9. PITHECIA. 59 
Pithecia, Desm. Brachyurus, Spiz. Yarkea, Lesson. 
See Monog., Gray, Proc. Zool. Soc. 1860, p. 228; and Anat., Flower, 
P. Z.8. 1862, p. 326, 
I. Forehead and crown with a central black streak ; hair one-co- 
loured. Pithecia. No. 1. 
II. Forehead and crown covered with hair, without any central 
streak. Yarkea. : 
a. Hairs white-tipped. Nos. 2, 3. 
6, Hairs with a subterminal ring. No. 4. 
* Fair one-coloured. Pithecia. 
1. Pithecia leucocephala. The Black Yarkee. 
Forehead with a central black streak, of male(?) yellow, of female(?) 
white. 
© Simia leucocephala, Audeb. Sing. vii. f. 2. Pithecia leucocephala, 
Geoff.; Gray, Zool, Sulphur, p. 12, t. 2 (head)! Simia ritheais” 
Schreb. t. 32. Pithecia ochrocephala, Kuhl, Beitr. p.-46.  ¢ P. 
chrysocephala, I. Geoff. Cat. Mamm. p. 53; Archiv. du Mus. vy. 
p. 587, t. 29; Gray, P. Z. S, 1860, p. 230! P. inusta, Spir, Bras. 
p. 15,t.138? Saki, Buffon, H. N. xv. t. 12. 
Hab. Brazil. 
The forehead is yellow when fresh, and white when faded by ex- 
posure. M. Geoffroy thinks the colour depends on the size of the 
specimen. 
** Hair harsh, white tipped. 
2. Pithecia monachus. The Yarkee. B.M. 
Black, grey-washed; hairs very long, harsh, white-tipped; fore- 
head and crown of male yellow, of female white. 
Yarque, Buffon, Suppl. vii. t.30 (bad). Simia monachus, Humb. Pi- 
thecia monachus, Geoff. Ann. du Mus. xix.; Gray, P. Z. S. 1860, 
p. 230; Flower, P. Z. S. 1862, t. 37! Is. Geoff. ; Castelnau, Expéd. 
Amér. Sud, t. 8. P. hirsuta, Spix, Bras.t. P. quapa, Poeppig. 
P. nocturna, var., Lesson. PP. irrorata, Gray, Zool. Sulph. p. 14, 
t. 8 (forehead bald)! Ann. & Mag. N. H. 1842, x. p. 256! 
Hab. Brazil. 
The specimen described by M. Geoffroy was young and in a very 
bad state; the one in the British Museum, figured in the ‘ Voyage of 
the Sulphur,’ t., has the face quite bald. This is now shown to be 
accidental, as the others, more lately received, have white hairs on 
the face. 
3. Pithecia albicans. The Whitish Yarkee. B.M. 
Yellowish white; tail and large patch on the back black, slightly 
washed with white; hairs with short white tips. Male, female, and 
young alike. 
